EP0935353B1 - Ein asymetrisches Vielfachzugriffsprotokoll für ein Kommunikationssystem - Google Patents

Ein asymetrisches Vielfachzugriffsprotokoll für ein Kommunikationssystem Download PDF

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Publication number
EP0935353B1
EP0935353B1 EP98308353A EP98308353A EP0935353B1 EP 0935353 B1 EP0935353 B1 EP 0935353B1 EP 98308353 A EP98308353 A EP 98308353A EP 98308353 A EP98308353 A EP 98308353A EP 0935353 B1 EP0935353 B1 EP 0935353B1
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EP
European Patent Office
Prior art keywords
compulsory
slots
slot
mobile station
uplink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98308353A
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English (en)
French (fr)
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EP0935353A1 (de
Inventor
Charlotte Baden
Qiang Cao
Lorenz Fred Freiberg
David Jonathan Reader
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia of America Corp
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Alcatel Lucent USA Inc
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Publication date
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Priority to EP98308353A priority Critical patent/EP0935353B1/de
Publication of EP0935353A1 publication Critical patent/EP0935353A1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/27—Control channels or signalling for resource management between access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • This invention relates to a multiple access protocol for a communication system, and in particular to an asymmetric access protocol for a mobile cellular communication system using time division duplexing (TDD).
  • TDD time division duplexing
  • EP766416 A describes a wireless multiple access communication systems which dynamically allocates available frame slots to uplink and downlink.
  • a cancellation signal corresponding to or otherwise representative of the interfering signal, (from an interfering base station to an interfered-with base station) is used.
  • the cancellation signal is used to cancel or otherwise offset the mixed interference produced in a received composite signal which includes both the desired mobile station to base station (uplink) signal and the interfering signal.
  • interference cancellation technique timing adjustment, amplitude adjustment, etc
  • the base station - base station link needs to be maintained, hence the involvement of a Base Station Control (BSC), which is higher level over BS.
  • BSC Base Station Control
  • EP766416 describes a system used purely for cancelling or Reducing co-channel interference purposes by the means of slot allocation (between downlink and uplink) in a frequency reuse cell (essentially non-adjacent cells system.
  • EP 720 321 A1 describes a similar, TDMA only system.
  • the system is used in either non-cellular systems or cellular system with identical asymmetric pattern, that is where the asymmetric ratio of each cell is the same.
  • the system uses 'flexible uplink/downlink allocation' achieved by system level flexible uplink/downlink allocation, in which the asymmetric ratio is all the same for all cells.
  • EP-A-0720405 is referred to as background. It is known from EP-A-0720405 to provide a method of time division duplexing in a mobile cellular communication system comprising:
  • the present invention is characterised over the disclosure of EP-A-0720405 in that inhibiting a mobile station from using selected slots of frames dependent upon the mobile station being determined as is an area where drown-out would otherwise occur, the selected slots not including the compulsory uplink communication slot and compulsory downlink communication slot.
  • the position of the compulsory slots may be determined by a central controller and the position, within the frame, of the compulsory slots will be the same in each cell.
  • the invention provides an asymmetric TDD system in which resources are allocated on a cell by cell basis, thereby achieving a more flexible and efficient system. All data packets transmitted in a slot can be arranged into consecutive slots; that is uplink slots and downlink slots can be arranged consecutively, thereby obviating the need for guard time between the same type of slot. Since the invention allows an asymmetric traffic ratio (uplink:downlink) for each cell the channel efficiency is improved. Since each base station may allocate uplink and downlink slots according to the type of traffic experienced by a cell, the traffic ratio may be adjusted dynamically.
  • the slots may be arranged into frames, with the asymmetric traffic ratio being repeated on a frame by frame basis.
  • the base station may broadcast the traffic ratio (i.e. the uplink and downlink allocation) on a general information channel BCCH, so that each mobile station entering a cell is provided with the traffic ratio.
  • the central co-ordinating controller may also organise the length of a frame, and govern the timing of frames from cell to cell.
  • Each frame may include a compulsory uplink slot and a compulsory downlink slot, which may for example take the first two slots of each frame.
  • the compulsory slots may be the same for each cell, leading to easy handover between cells, for a mobile station travelling between cells.
  • the frame rate and compulsory slot allocation may be chosen in such a way that a mobile station, restricted to the compulsory slots only, will not suffer from a reduced QoS, particularly if running a delay sensitive application.
  • An end-user device may use any one of a number of communication protocols to communicate with its nearest base station 13, via antennae 10 and 11, across an air interface 12.
  • the communication protocol used is CDMA (code division multiple access). This enables the mobile stations to communicate using a coded spread spectrum signal with codes which are almost uncorrelated, thereby providing a multiple access communications protocol in which the collisions are not destructive of other signals broadcast concurrently.
  • the base station continually broadcasts information on its broadcast control channel (BCCH) to all mobile stations within range.
  • BCCH information includes various codes and control signals necessary for a mobile station to register into the system and the traffic ratio (uplink:downlink).
  • Each mobile station uses the relative strength of the BCCH from neighbouring base stations to determine whether handover to another base station is appropriate.
  • a base station may page a mobile station on the paging channel (PCH) or, alternatively, a mobile station may request access to the system on the random access channel (RACH).
  • PCH paging channel
  • RACH random access channel
  • Data transmitted over the TCH is divided into packets, which are transmitted in a particular slot with appropriate control bits.
  • Figure 2 shows a communication system with overlapping cell coverage (15a, 15b, 15c) supplied by a number of base stations (13a, 13b, 13c).
  • the cell coverage is more often represented as a honeycomb structure, the actual coverage depends on the environmental features, and a large overlap (e.g. 20) can occur.
  • the general overlap (21) is the handover area in which the signals from adjacent base stations are received by a mobile station with equal strength. A mobile station may request handover from one base station (13a) to another (13b) in this area (22).
  • FIG 3 illustrates the uplink and downlink traffic in a frame for three adjacent cells 15a, 15b, 15c.
  • Each frame includes a compulsory downlink slot (CDS) which the central controller 16 has allocated to the first slot of each frame (30a, 30b, 30c).
  • the frames also include a compulsory uplink slot (CUS) which the central controller 16 allocates to the second slot of each frame (31a, 31b, 31c).
  • CDS compulsory downlink slot
  • CCS compulsory uplink slot
  • cells 15b and 15c are using the same traffic ratio, which in this case is 4:6 (downlink:uplink) distributed as 1 down: 1 up: 2 down: 5 up: 1 down.
  • Cell 15a is using a different traffic ratio of 5:5, distributed as 1 down: 1 up: 3 down: 3 up: 1 down: 1 up.
  • the size of the inhibiting area will depend on a number of factors, such as signal power control and the signal processing ability of both the base stations and the mobile stations. Also shown on Figure 4 is the collision area 41, which is the area of cell coverage where collision actually occur, requiring the data packet transmitted in corrupted slot to be retransmitted.
  • the inhibiting area is determined by each mobile stations' ability to recognise that it is an area where collisions are likely. A reasonable estimate of the collision area can be determined using existing cellular communications technology, such as the GSM (Group Special Mobile or Global System for Mobile Communications) system. Using a similar algorithm to that used for handover, the inhibiting area will consist of the area of overlap between two cells.
  • mobile stations will be continually searching for the beacon signal (BCCH signal) broadcast constantly by all base stations.
  • the beacon signal will contain information concerning the traffic ratio currently being employed by the base station. If the adjacent base station beacon signal indicates a different traffic ratio to that currently employed by the mobile station and when the power level of the beacon signal reaches a predetermined threshold, the mobile will consider itself within an inhibiting area. Mobile stations may not recognise the full extent of the collision area since collisions depend upon the presence of two interfering mobile stations.
  • Each mobile system may be provided with geographical location mechanism, enabling the mobile station to accurately determine its position relative to each base station. Such a mechanism would utilise, for example, base station triangulation.
  • each mobile could be fitted with a satellite positioning system such as a GPS locator.
  • the traffic ratio of each cell is known by the central controller. This information, along with the accurate positioning information determined for each mobile station would enable the central controller to determine whether a particular mobile station needs to be fully or partially inhibited. It may not be necessary to restrict mobile stations to the compulsory slots since, as shown in Figure 3 , slots 32, 33, 35, 36 and 37 have been given the same allocation by base stations 13a and 13b (cells 15a and 15b).
  • mobile stations 2 and 3 could be partially inhibited, that is prevented from using slots 34, 38 and 39 when in the inhibiting area 40.
  • Mobile stations may be required to use only the compulsory slots at, for example, the intersection of three cells, such as shown by point 24 of Figure 2 .
  • the frame length is shown as 16ms, and the slot length is 1.6ms.
  • coded by a voice coder at a rate of 32000 bits/second, or 512 bits/frame. Assuming 64 information bits are added, for header and other information, this gives a speech data packet of 576 bits. Thus the data rate must be at least 360,000 bits per second, if the mobile station is limited to sending all the speech data in the compulsory uplink.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (8)

  1. Ein Zeitduplexverfahren in einem zellularen Mobilfunk-Kommunikationssystem, umfassend:
    Unterteilen des Kommunikationssystems in eine Mehrzahl von Zellen (15a, 15b, 15c), wobei jede Zelle von einer Basisstation (13a, 13b, 13c) bedient wird;
    Bereitstellen eines Kanals im Kommunikationssystem, über welchen eine Basisstation und mindestens eine Mobilstation miteinander kommunizieren können;
    Verwenden von Zeitduplex für die Unterteilung des Kanals in eine Mehrzahl von Rahmen, wobei jeder Rahmen aus einer Mehrzahl von Zeitschlitzen (30a bis 39a, 30b bis 39b, 30c bis 39c) besteht;
    Koordinieren des Zeitduplex quer durch die Mehrzahl von Zellen; und wobei
    jede Basisstation (13a, 13b, 13c) Zeitschlitze entweder an die Uplink-Kommunikation oder an die Downlink-Kommunikation zuweist, um den Durchsatz im Kanal zu optimieren;
    wobei
    jeder Rahmen einen zwingend vorgegebenen Uplink-Kommunikationszeitschlitz (31a, 31b, 31c) und einen zwingend vorgegebenen Downlink-Kommunikationszeitschlitz (30a, 30b, 30c) umfasst, und gekennzeichnet durch
    Hemmen einer Mobilstation an der Benutzung ausgewählter Zeitschlitze von Rahmen in Abhängigkeit davon, ob die Mobilstation als sich in einem Bereich (40) aufhaltend bestimmt wird, wo anderenfalls ein Übertönen auftreten würde, wobei die ausgewählten Zeitschlitze weder den zwingend vorgegebenen Uplink-Kommunikationszeitschlitz (31 a, 31 b, 31 c) noch den zwingend vorgegebenen Downlink-Kommunikationszeitschlitz (30a, 30b, 30c) umfassen.
  2. Verfahren nach Anspruch 1, wobei das Hemmen der Mobilstation die Mobilstation selektiv an der Verwendung aller Zeitschlitze, mit Ausnahme des zwingend vorgegebenen Uplink-Kommunikationszeitschlitzes (31a, 31b, 31c) und des zwingend vorgegebenen Downlink-Kommunikationszeitschlitzes (30a, 30b, 30c), der Rahmen hemmt.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Position der zwingend vorgegebenen Zeitschlitze von einer Zentralsteuerung bestimmt wird.
  4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Position der zwingend vorgegebenen Zeitschlitze in jeder Zelle dieselbe ist.
  5. Zeitduplexsystem in einem zellularen Mobilfunk-Kommunikationssystem, umfassend:
    Mindestens eine Mobilstation (2, 3, 4, 5, 6) und eine Mehrzahl von Basisstationen (13a, 13b, 13c), welche jeweils eine Zelle (15a, 15b, 15c) des Kommunikationssystems bedienen;
    einen Kanal im Kommunikationssystem, über welchen eine Basisstation und mindestens eine Mobilstation kommunizieren können, wobei der Kanal unter Verwendung von Zeitduplex in eine Mehrzahl von Rahmen unterteilt ist, wobei jeder Rahmen aus einer Mehrzahl von Zeitschlitzen (30a bis 39a, 30b bis 39b, 30c bis 39c) besteht;
    eine Zentralsteuerung (16) für die Koordinierung des Zeitduplex quer durch eine Mehrzahl von Zellen, und wobei
    jede Basisstation dazu ausgelegt ist, entweder der Uplink-Kommunikation oder der Downlink-Kommunikation Zeitschlitze zuzuweisen, um den Durchsatz im Kanal zu optimieren;
    wobei
    jeder Rahmen einen zwingend vorgegebenen Uplink-Zeitschlitz (31a, 31b, 31c) und einen zwingend vorgegebenen Downlink-Zeitschlitz (30a, 30b, 30c) umfasst,
    dadurch gekennzeichnet, dass das System Mittel zum Hemmen einer Mobilstation an der Benutzung von ausgewählten Zeitschlitzen von Rahmen in Abhängigkeit davon, ob bestimmt wird, dass sich die Mobilstation in einem Bereich (40) befindet, in welchem anderenfalls ein Übertönen auftreten würde, umfasst,
    die ausgewählten Zeitschlitze keinen zwingend vorgegebenen Uplink-Kommunikationszeitschlitz (31a, 31b, 31c) und keinen zwingend vorgegebenen Downlink-Kommunikationszeitschlitz (30a, 30b, 30c) umfassen.
  6. System nach Anspruch 5, wobei die Mobilstation selektiv an der Verwendung aller Zeitschlitze, mit Ausnahme des zwingend vorgegebenen Uplink-Kommunikationszeitschlitzes (31a, 31b, 31c) und des zwingend vorgegebenen Downlink-Kommunikationszeitschlitzes (30a, 30b, 30c), der Rahmen gehemmt wird.
  7. System nach Anspruch 5, dadurch gekennzeichnet, dass die Zentralsteuerung (16) für die Bestimmung der Position der zwingend vorgegebenen Zeitschlitze ausgelegt ist.
  8. System nach Anspruch 7, dadurch gekennzeichnet, dass die Zentralsteuerung (16) für das Anordnen der zwingend vorgegebenen Zeitschlitze in derselben Position in jedem Rahmen und in jeder Zelle ausgelegt ist.
EP98308353A 1997-10-31 1998-10-13 Ein asymetrisches Vielfachzugriffsprotokoll für ein Kommunikationssystem Expired - Lifetime EP0935353B1 (de)

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Application Number Priority Date Filing Date Title
EP98308353A EP0935353B1 (de) 1997-10-31 1998-10-13 Ein asymetrisches Vielfachzugriffsprotokoll für ein Kommunikationssystem

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Application Number Priority Date Filing Date Title
EP97308743 1997-10-31
EP97308743 1997-10-31
EP98308353A EP0935353B1 (de) 1997-10-31 1998-10-13 Ein asymetrisches Vielfachzugriffsprotokoll für ein Kommunikationssystem

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EP0935353B1 true EP0935353B1 (de) 2011-08-24

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1063855B1 (de) * 1999-06-24 2009-08-05 Alcatel Lucent System zur asymmetrischen Datenübertragung in einem Funkkommunikationssystem
SG114476A1 (en) 1999-11-04 2005-09-28 Ntt Docomo Inc Method, base station and mobile station for timeslot selection and timeslot assignment
GB9930089D0 (en) * 1999-12-20 2000-02-09 Nokia Networks Oy Communications networks
JP2002232940A (ja) * 2001-02-05 2002-08-16 Ntt Docomo Inc タイムスロット割り当て装置、タイムスロット割り当て方法、移動体通信システム及びその動作方法、プログラム、記録媒体
EP1964332B1 (de) 2005-12-19 2013-09-25 Gigaset Communications GmbH Verfahren zum übertragen von teilnehmerspezifischen daten
JP4618456B2 (ja) * 2008-05-28 2011-01-26 日本電気株式会社 無線通信システム、無線端末、管理装置、およびセッション制御方法
US20120113875A1 (en) * 2009-01-27 2012-05-10 Nokia Corporation Method and apparatus for dynamically modifying a transmission frame
KR20110019313A (ko) 2009-08-19 2011-02-25 삼성전자주식회사 무선 통신 시스템에서 트래픽 클래스별 무선 자원의 사용량을 측정하는 방법 및 장치

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4319830A1 (de) * 1993-06-16 1995-03-09 Philips Patentverwaltung CDMA Übertragungssystem
US5594720A (en) 1993-11-24 1997-01-14 Lucent Technologies Inc. Multiple access cellular communication with dynamic slot allocation and reduced co-channel interferences
US5602836A (en) 1993-11-24 1997-02-11 Lucent Technologies Inc. Multiple access cellular communication with circular interleaving and reduced dropped-packet runlengths
US5768254A (en) 1995-09-29 1998-06-16 Lucent Technologies Inc. Multiple access cellular communication with signal cancellation to reduce co-channel interference

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